Details on DTCs

U2142-00: (CMU) DETECTION CONDITION AND POSSIBLE CAUSE (WITHOUT EMERGENCY CALL SYSTEM)

System malfunction location	Communication error with microphone
Detection condition	Determination conditions	The connectivity master unit (CMU) detects a response error from the microphone, and even though retries and relaunches are performed continuously, the malfunction condition continues.
	Preconditions	Not applicable
	Malfunction determination period	Not applicable
Fail-safe	If there is a malfunction in control circuit: If it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. If a communication error is detected and when it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. The microphone setting value is periodically verified and if there is a malfunction, a setting value that protects the connectivity master unit (CMU) is set. If there is a malfunction in microphone power supply circuit: If it does not return to normal even though the power supply for the microphone is turned on/off repeatedly for the specified number of times, it is determined that the microphone is undetected, and the operation continues. The microphone setting value is periodically verified and if there is a malfunction, a setting value that protects the connectivity master unit (CMU) is set.
Vehicle status when DTCs are output	Not applicable
Possible cause	Malfunction in wiring harness (including connector/terminal) between microphone and connectivity master unit (CMU) Microphone malfunction Connectivity master unit (CMU) malfunction